var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
const cors = require('cors');  

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');

var app = express();
app.use(cors());  

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/users', usersRouter);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

app.use(cors({  
  origin: 'http://localhost:8080', // 允许来自这个源的请求  
  methods: ['GET', 'POST'], // 允许的HTTP方法列表  
  allowedHeaders: ['Content-Type', 'Authorization'], // 允许的请求头列表  
  credentials: true, // 如果你的请求包含cookie，需要设置为true  
}));  

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
